package demo;

import example.common.Constant;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;

import java.net.InetSocketAddress;

/**
 * Created by juemingzi on 16/5/27.
 */
public class EchoClient {

    private final String host;
    private final int port;

    public EchoClient(String host, int port) {
        this.host = host;
        this.port = port;
    }

    public void start() throws Exception {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();              //1
            b.group(group)                              //2
                    .channel(NioSocketChannel.class)           //3
                    .remoteAddress(new InetSocketAddress(host, port))  //4
                    .handler(new ChannelInitializer<SocketChannel>() { //5
                        @Override
                        public void initChannel(SocketChannel ch)
                                throws Exception {
                            ch.pipeline().addLast(
                                    new EchoClientHandler());
                        }
                    });

            ChannelFuture f = b.connect().sync();       //6

            f.channel().closeFuture().sync();           //7
        } finally {
            group.shutdownGracefully().sync();          //8
        }
    }

    public static void main(String[] args) throws Exception {
//        if (args.length != 2) {
//            System.err.println(
//                    "Usage: " + EchoClient.class.getSimpleName() +
//                            " <host> <port>");
//            return;
//        }
//
//        final String host = args[0];
//        final int port = Integer.parseInt(args[1]);

        new EchoClient("localhost", Constant.PORT).start();
    }
}